def add_two_numbers(a,b):
    return a+b

print(add_two_numbers(10,20))

def is_prime(n):
    if n<=1:
        return False
    for i in range(2, n):
        if n % i == 0:
            return False
    return True


def test(a,b,c=10,*rty,**ewi):
    return a


def factorial(n):
    if n==0:
        return 1
    else:
        return n*factorial(n-1)
print(factorial(5))